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Evening Read

It was AncestryDNA’s customer-service rep who had to break the news to Catherine St Clair.

For her part, St Clair thought she was inquiring about a technical glitch. Her brother—the brother who along with three other siblings had gifted her the DNA test for her birthday—wasn’t showing up right in her family tree. It was not a glitch, the woman on the line had to explain gently, if this news can ever land gently: The man St Clair thought of as her brother only shared enough DNA with her to be a half sibling. In fact, she didn’t match any family members on her father’s side. Her biological father must be someone else.